Based on a chambray shirt originally issued to firefighters in St. Louis, Missouri during the 1930s, the 'St Louis' shirt by Post Overalls is a fantastic reinterpretation of an American workwear classic. This plaid flannel button up is made from 100% cotton and features a textured check design. The chest pockets have button closures and bar tacks for durability and the left pocket has a handy pen slot. With chain stitch run off and a dagger collar, this shirt has all the heritage details we know and love.